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v3.24.3

Investments - Cost or Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 1,337,397 | $ 1,162,919 |
Allowance for Expected Credit Losses | (558) | (566) | $ (920)
Gross Unrealized Gains | 8,640 | 2,115 |
Gross Unrealized Losses | (68,747) | (100,138) |
Fair Value | 1,276,732 | 1,064,330 |
U.S. government obligations and agencies |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 20,209 | 23,886 |
Allowance for Expected Credit Losses | 0 | 0 |
Gross Unrealized Gains | 226 | 49 |
Gross Unrealized Losses | (332) | (677) |
Fair Value | 20,103 | 23,258 |
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 905,947 | 779,177 |
Allowance for Expected Credit Losses | (459) | (469) |
Gross Unrealized Gains | 5,671 | 1,097 |
Gross Unrealized Losses | (41,896) | (64,091) |
Fair Value | 869,263 | 715,714 |
Mortgage-backed and asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 385,871 | 334,460 |
Allowance for Expected Credit Losses | 0 | 0 |
Gross Unrealized Gains | 2,708 | 969 |
Gross Unrealized Losses | (24,830) | (32,283) |
Fair Value | 363,749 | 303,146 |
Municipal bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 15,891 | 15,916 |
Allowance for Expected Credit Losses | (1) | (4) |
Gross Unrealized Gains | 10 | 0 |
Gross Unrealized Losses | (1,282) | (1,873) |
Fair Value | 14,618 | 14,039 |
Redeemable preferred stock |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 9,479 | 9,480 |
Allowance for Expected Credit Losses | (98) | (93) | $ (189)
Gross Unrealized Gains | 25 | 0 |
Gross Unrealized Losses | (407) | (1,214) |
Fair Value | $ 8,999 | $ 8,173 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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